Lincoln Service Parts 2 › Lincoln Electric 9SS31648-3 HEX SOCKET PLUG - 3/8 NPT S31648-3 Lincoln Electric 9SS31648-3 HEX SOCKET PLUG - 3/8 NPT S31648-3 Sale Price: $2.33 Original Price: $2.68 HEX SOCKET PLUG - 3/8 NPT PURCHASE PRICE SHOWN IS FOR A QUANTITY OF 1 Add To Cart Added! HEX SOCKET PLUG - 3/8 NPT PURCHASE PRICE SHOWN IS FOR A QUANTITY OF 1